Apparatus for raising fluids from oil wells



Oli. 22, 1929.

L. M. ROBINSON APPARATUS FOR RAISING FLUIDS FROM OIL WELLS Filed June 13, 1927 2 Sheets-Sheet 1 .....-u-.... ....h -..w

ATTORNEY L. M. ROBINSON APPARATUS FOR RAISING FLUIDS FROM OIL WELLS Filed June 15. 1927 2 sheets-sheet 2 ATTORNEY ldatented ct. 22, 1929 .fr osmosi N LUTHER iu. nonrnsoiv, oru nnnonwnrin, ennui-reina APPARATUS FR RAISIMG Application filed June 1,3,

This invention relates to an apparatus for raising fluids from oil wells.

is is well known, tluid is raised from an oil well by the working barrel of a pump. The

,- amount ol lluid raised for each stroke is limited by the relatively small capacity of the working barrel, due to the relatively small diameter of the tubing in the well.

My invention contemplates an apparatus for increasing the capacity of the pumping api'iaratus, by increasing the oil lift due to a plurality et pistons operated by a single plunger and a plurality of working barrels, one for each piston. The reciprocatin pump has two stages, the lirst operating in the usual way having a diameter equal to the pump plunger and the second of greater capacity, and as both pistons operate at the same time, it is obvious that more than the usual amount olf oil will be raised at each lifting stroke of the plunger.

An important feature of my invention is that it serves as a combined gas and liquid pump and as illustrated, the larger and up per working barrel acts as a gas relief device, the piston in the upper working barrel pumping olif the gas, where any exists, so that the smaller and lower working barrel will pump oli' the liquid or liuid77 as it is generally called.

rthe novelty of my invention will be better understood by reference to the following description in connection with the accompanying drawings in which Fig. 1 is a sectional view through a pump mechanism constructed in accordance with my invention.

Fig. 2 is an enlarged perspective view of one plunger, one piston, the outer and upper working barrel and the casing.

Fig. 3 is an enlarged fragmentary section al view through the pump mechanism of both barrels.

4 is a sectional view on the line 4--a of Fig. 1 and 5 is a sectional view on the line 5 5 ot Figure 1.

Referring, now, to the drawings by numerals ot reference, 1 designates a string of pipe in which is a seating collar 2. The seating nnurns rnoiu OIL Wenns les?. serial No. leasen'. r

collar `has, a conical seat 3 carrying a casting in the form of a seating nut l in which `are passage ways 5. The seating nut carries a strainer' `6. :The seating nut, also, supports the working barrels 7 and 8 in spaced parallel relation. At the bottom or the working barrel, with the edectivepart of the outerbarrel above the innerone, is a standing valve `9 which may be oli any preferred construction. rllie hollow plunger l() carries a traveling ,V valve 11 of usual construction `and itcarres the usual `piston 12 .with the usual cups 13. At the top of the hollow .plunger is a ,sand valve 14. Therefore, when the plunger moves on its upstrolre, its end 15 will raise, unseating the standing valve 9, drawing oilinto the working barrel. `On thedownfstroke, the standing valve 9 will close and the valves `1l and llrwill unseat, discharging oil into the pipe 1. This, in eilect, would be usual practice. In addition to the working barrel 7 I have provided a working barrel@ `which "is connected to the seating nut l and surrounds the Vpassage ways 5 and whichsurrounds `the working barrel 7. Since the eiii'ective pant of the barrel 8 is above `the ,barrel 7, I lhave provided a lower working barrel and an upper working barrel. Obviously, the distancetlie upper working barrel is above the lower `one will depend to some M,extent upon the `estimated gas pressure encountered in thewell. rl`hereiore, these distances may be varied lto suit the particular*conditions of the particular well `in which the device is to be installed.

At the top of the working barrel 7 is a y, valved headj 16 having passage `waysll leading from the space between the two working barrels `7 and 8 to the stage 18 above the head and within the workingA barrel 8. The pas `sage ways 17 are normally closed by standing valves 19 `corresponding to the standing valve 9. In the` stage 18 is a piston 20lcarrie`d bythe plunger 10 audit has passage `ways21 with working valves 22 normally closing them. At the head or upper end oftheupper .95 working barrel 8 4is a head 23 with passage ways 211 normally closed by the sand valves25. Consequently, when the plunger 10 `moves 1on itsup-strole, oil will be pulled throughthe Hpassage ways' into thespace between `the ,1639

f ,plunger 10, the standing valves 9 and 19 will be closed. The traveling valves 22 and the sand valves 25 Will unseat so that oil'Will pass from the Working barrel 8 into the pipe 1. The pipe may be of relative large tubing or it may be the casing in the Well. The valves 19, 22 and 25 may be arranged in circular series about the aXis of the plunger, each valve closing a. portv or passage Way. The combined areas of the passage Ways providing ample spaces through Which the oil may pass and by reference to the drawings it Will be apparent that the fluid from both Working barrels Will discharge into the pipe 1 Where it may flow to the top of the Well.

l/Vith such a construction, the output of the Well Will be materially increased over what is possible With a single stage, single acting pump. My invention, constructed as shown, really consists of a multiple stage, single acting pump structure With a plurality of pistons operated by the same plunger, one piston being of greater diameter than the other, With the several pistons arranged in tandem. I do not Wish to be limited, hoW- ever, to the exact details of construction shown, for obviously, changes in form, proportion and minor details of construction may be made Wit-hout departing from the Vspirit vof my invention or sacrilicing any of its advantages.

A by no means unimportant feature of my invention 1s the provision of means whereby the illustrated structure serves as a combined liquid. In other Words this invention has an advantage over the ordinary pump because Withpthe ordinary pump, using a single Working barrel, the gas pressure is sometimes enough to raise or unseat the standing valve and the traveling valve and hold them open While the plunger ismoving up and down. This, obviously, destroys the effectiveness of the pump. With my invention, the larger and uppervworking barrel will take care of the gas because the lighter valves 19 Will unseat before the heavier valve'9, consequently, thegas pressure Will be relieved through the upper Working barrel. In this connection, it lWill be noted that all the valves of the smaller Working barrel and plunger are heavier than the valves associated directly With the upper Working barrel.

Vhat I claim and desire to secure by Letters-Patent is 1. In combination with a string of pipe having a seating collar, a Working barrel carried by the seating collar, a Working barrel Within the first named Working barrel, independent plungers for the Working barrels7 a rod for simultaneously operating the .said plungers Within the respective Working barrels, each Workino` barrel having an independent inlet, part of the lirst named Working barrel extending above the second mentioned Working barrel and standing valves at the tous of the respective Working barrels.

2. In combination with a string of pipe having a seating collai, a Working barrel carried by the seating collar, a working barrel Within the first named Working barrel, independent plungers for the working barrels, a rod for simultaneously operating the said plungers Within the respective Working barrels, each Working barrel having an independent inlet, part of the first named Working barrel extending above the second inentioned Working barrel, standing valves at the tops of the respective Working barrels and standing valves in the plunger of the lirst named Working barrel.

In testimony whereof I alli; mv signature.

LUTHER M. ROBINSON. 

